Abstract
Paspalum glaucescens belongs to the informal group Plicatula, reproductively characterized by the dominance of tetraploid apomitic lines in most of its populations, with rare diploid, sexual counterparts. The species shows high phenotypic variation. Twenty nine Southern Brazilian accessions were cytologically and morphologically analysed. Most of the accessions were tetraploid (2n = 4x = 40). Meiotic study of three tetraploids showed their irregular behaviour. Eight accessions presented the diploid level (2n = 2x = 20).This can be considered a very high frequency of diploids in a member of the Plicatula group. While the tetraploids are concentrated at the highest elevations, diploids were detected mostly in the lowlands. Average stomatal sizes were quite distinct on different ploidy levels, being larger in tetraploids.
Similar content being viewed by others
References
Barreto, I.L., 1956. Las especies afines a Paspalum plicatulum en Rio Grande del Sur (Brasil). Rev Arg Agron 23: 53-70.
Burson, B.L. & H.W. Bennett, 1970. Cytology, method of reproduction, and fertility of Brunswickgrass, Paspalum nicorae Parodi. Crop Sci 10: 184-187.
Burson, B.L. & H.W. Bennett, 1971a. Chromosome numbers, microsporogenesis, and mode of reproduction of seven Paspalum species. Crop Sci 11: 292-294.
Burson, B.L. & H.W. Bennett, 1971b. Meiotic and reproductive behavior of some introduced Paspalum species. J Miss Acad Sci 17: 5-8.
Chase, A., 1929. The North American species of Paspalum. Contr US Natl Herb 28: 1-310.
de Wet, J.M.J., 1954. The genus Danthonia in grass phylogeny. Amer J Botany 41: 204-211.
Moraes-Fernandes, M.I.B., I.L. Barreto, F.M. Salzano & A.M.O.F. Sacchet, 1974. Cytological and evolutionary relationships in Brazilian forms of Paspalum (Gramineae). Caryologia 27: 455-465.
't Mannetje, L., 1961. A key based on vegetative characters of some introduced species of Paspalum L. CSIRO/Melbourne: Australia. (Div Trop Past Tech Pap. N° 1) Pritchard, A.J., 1962. The cytology and reproduction of Paspalum yaguaronense (Henr.). Aust J Agric Res 13: 206-211.
Pozzobon, M.T. & J.F.M. Valls, 1987. Caracterizaç ã o citogenética em acessos de germoplasma de espécies brasileiras de Paspalum (Gramineae). In: Encontro Internacional sobre Melhoramento Genético de Paspalum, Anais, Nova Odessa, Instituto de Zootecnia, pp. 73-79.
Quarín, C.L., 1992. The nature of apomixis and its origin in panicoid grasses. Apomixis Newsl 5: 8-15.
Quarín, C.L., M.T. Pozzobon & J.F.M. Valls, 1996. Cytology and reproductive behaviour of diploid, tetraploid and hexaploid germplasm accessions of a wild forage grass: Paspalum compressifolium. Euphytica 90: 345-349.
Quarín, C.L., J.F.M. Valls & M.H. Urbani, 1997. Cytological and reproductive behavior of Paspalum atratum, a promising forage grass for the tropics. Trop Grasslands 31: 114-116.
Rambo, B., 1954. Histó ria da flora do litoral riograndense. Sellowia 6: 113-172.
Renvoize, S.A., 1988. Hatschbach's Paraná Grasses. London, Royal Botanic Gardens, 76 pp.
Sacchet, A.M.O.F., 1973. Citogenética e evoluç ã o de gramíneas naturais do Rio Grande do Sul: grupos Plicatula e Quadrifaria-Gê nero Paspalum. Tese de Mestrado-Genética, UFRGS, Porto Alegre, 55 pp.
Swallen, J.R., 1967. New species of Paspalum. Phytologia 14: 358-389.
Takayama, S.Y., P.M. Freitas, M.S. Pagliarini & L.A.R. Batista, 1998. Chromosome number in germplasm accessions of Paspalum (Plicatula group) from different regions in Brazil. Euphytica 99: 89-94.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Pozzobon, M., Valls, J. Cytogeography and variation of stomatal size of Paspalum Glaucescens (Gramineae; Paniceae) in Southern Brazil. Euphytica 116, 251–256 (2000). https://doi.org/10.1023/A:1004005230300
Issue Date:
DOI: https://doi.org/10.1023/A:1004005230300